When you throw a wooden block through a laser, it is supposed to ignite. (Please see attached.) The wooden block with the circle on it? I've just thrown it there. It didn't ignite, and so I can't complete the level. If I throw that same block though another section of one of the two lasers, it sometimes ignites. Sometimes it doesn't. But throwing it into this position (necessary to progress) reliably fails.

I'm trying to be patient with this game, but the many bugs are making it very difficult.

The game opts for learn-by-doing system rather than a tutorial, which is a great way to fly, unless you encounter a bug when you first meet a new block. Mesh blocks, for example. You can pick up blocks through mesh blocks, but you can't throw blocks through them. Nor can you (in theory) pass through them. But the autopath feature draws a nice white path through them, as if you can fly on through. And the first one I encountered, I was able to fly on through. Then I got stuck in the dead end beyond it, as I couldn't pass back again. I looked at the block description, and it said something cryptic about "one way only". So I get to bash away at these blocks, trying to figure out how they work, entirely confused because some of them don't work as intended (and again, that misleading autopath).

Plus, I don't know if I've solved some puzzles correctly. Sometimes, when I throw a block, I can get under it. Sometimes, the thrown block and I inhabit the same square. That is, the bot is obscured by a sand block or stone block that has fallen or been thrown. It's as if collision detection is broken somehow: wooden blocks sometimes ignore lasers, you can sometimes fly right on through mesh blocks, or occupy the same space as other blocks.

And as others have said, the undo button is broken. If you toss a block, and click undo, the block reappears in your inventory. Except it's not really there, as you'll find when you try and throw it again. If I undo up to where I initially picked up the block (however many turns that was), I can pick it up again and really have it.

I want to enjoy the game, but it's a sloppy mess, and I'm tired of wrestling with unintended behaviors.

I read somewhere that most of the bugs in the game are directly related to the undo feature. I would suggest trying to see if you duplicate your wooden block problem again without using undo at all for that level. I hit a bunch of glitches and bugs in the game while I played it as you have, and I don't like it either but the overall experience is still good. Nothing beats that "a-ha!" moment when you figure out. I would say keep with it for a little bit more.

As far as I know, only Level 8-4 is not completable.

Thanks for the advice, but I tried restarting the game and replaying the above level several times before complaining. On the assumption that the game wasn't testing for collisions often or quickly enough, I changed the visual settings to low. (Though the game appeared to be running reasonably.) Finally, I am able to pass the above level.

But my relief was short-lived. I am now on sector 4-4 (Something Trajectories) and I'm held up by another glitch. (Again, please see attached.) I load the mirror block into the cannon. It fires upwards through the water, and strikes the ceiling. It then falls, as expected. However, rather than landing on the water block, as expected, it falls right through again, back into the cannon. The screenshot is a picture of that block on the way down, having struck the ceiling. As you can see, it is falling through the water block.

The puzzles are enjoyable enough, but I am far too often restarting levels or the entire game, trying to figure out what is broken and what is working as expected. At this point, the game is just annoying me. It's a sloppy job.

I'm with you all the way on this - it's a great puzzle game but the bugs make this a nightmare.
I started another thread re: 8.4 which is impossible in the current version. I've so far tried to undo (and redone whole levels) just to find "the right way to solve it" but it doubles the time and more than halves the fun (as you explain well).

I'm personally expecting a refund until the game is playable