Today's patch should be the last big bug fixing and balancing patch before episode 2. It features improved platforming, a full screen map option, a fix for the falling through elevator bug, improvements to a ton of weapons and much more.

Added fullscreen map toggle.
Added new system to smooth player view with vertical movement like when moving on stairs.
Added saving the player position in the minigame on quit.
Added FPS limiter to options.
Added exit marker on map once discovered.
Changed movement physics to make platforming slightly easier.
Changed wood barrels to allow them to be picked up again.
Changed laughter chance to lower it when picking up treasures.
Changed particle effects of items and switches to make them more visible.
Changed secret rooms to remove their sound once discovered.
Changed the level of the second boss to be shorter.
Changed second boss to use more varied attacks.
Changed the iron sights switching speed of all weapons to make it faster.
Changed sound frequency in the asylum to make them rarer.
Changed several node descriptions in the skill tree to make them clearer.
Changed chained saw grappling hook to make it less suicidal and easier to use.
Changed gem staff to make it fire and charge faster.
Changed bow to make secondary fire cause a fiery explosion.
Changed bolt sniper rifle to fire faster.
Changed fire bolt book to improve visibility, cause burning areas and improve the alternate fire effect.
Changed ice bolt book to improve visibility and cause more damage.
Changed spark book to improve visibility, cause more damage and improve alternate fire.
Changed poison staff to add an explosion to the alternate fire.
Changed grenade harpooner to slightly improve harpoon visibility.
Changed ghost axes to improve alternate fire damage.
Changed fireball book to improve visibility and make alternate fire easier to use and more deadly.
Changed frost book to improve visibility.
Changed tempest book to improve visibility and raise damage of primary attack.
Fixed crash when switching weapons.
Fixed crash when pressing kick during game startup.
Fixed bug where you could fall through elevators.
Fixed bug where you could get stuck in doors.
Fixed bug where picking up the nightmare reaper powerup while switching weapons would make it or the weapon unusable.
Fixed bug where the "buy all skills from world" achievement was only unlocked once you got a skill from a different world.
Fixed bug where explosive barrels couldn't be thrown while moving backwards.
Fixed bug where life indicator was wrong at level start.
Fixed bug where stairs would use the wrong texture.
Fixed bug where medium rain was using wrong wetness effects.
Fixed bug where combo message would appear in asylum.
Fixed bug where velocity wasn't stopped when getting caught by enemy chains.
Fixed bug where the player could get stuck between pipes in a sewer room.
Fixed bug where the player could have three hands at the same time in the asylum.
Fixed bug where bow arrows or missiles would collide with each other.
Fixed bug where treasure couldn't be gotten in a world 4 minigame level.
Fixed bug where player could die in a loop in a world 4 minigame level.
Fixed bug where player couldn't reach the double jump powerup in a world 4 minigame level.
Fixed bug where player couldn't flush dirty toilets.
Fixed bug where grenade harpooner could have the charge time stat.
Fixed bug where wall decals where missing from the asylum.
Fixed bug where the player face could be bleeding at level start.
Fixed bug where crosshair change wasn't displayed dynamically in the options.
Fixed bug where a sign could be floating in the air in a forest map.
Fixed bug where a forest challenge room had jump pads that didn't work properly.
Fixed bug where the player would play the falling noise when dying in mid air.

Patch 4.1

Fixed bug where minigame would place the player at wrong position.
Fixed bug where the dying animation hands would be too high.
Fixed bug where slot machine cost would stay after being destroyed.
Fixed bug where using the mouse to change the FPS limit wouldn't hide the background.
Fixed bug where the ghost axes could have a charge time stat.
Fixed bug where the fireball book could have invalid stats.
Changed weapon drop sounds to make them slightly louder.
Changed weapon chests to count as decorations when destroyed.

GOG support says that it can take hours or days.