Niggles: Loved the first one. How does the second one compare? (and why isnt the the first on GOG?)
I have both on Steam. Personally, I prefer the first one simply because it was less flashy.
I played 2 when it was first released and the timing seemed off. Even after a few updates, I never felt like I could get my timing down. You're not shooting for platinum medals in this one so, in a sense, it's more forgiving. You can miss 4 or 5 times in a round and still get 5 stars. Another difference is that you aren't restricted to just 3 skills nor do you have to find them. You collect skill points from certain rounds and may place them in any skill you choose: multiple bullets for guns (yep, guns), insta-kill bosses (which there are now multiples of in a round) and many, many more. The non-weapon upgrade skills are the ones I like least because they tend to throw off my timing when they go off.
It's a bit more pleasing graphically and you can even customize your stick fighter to an extent. The map is more detailed and still features branching paths. The soundtrack is not very memorable (it's been a while since I last played it), but it's a bit of an improvement over the first.
Myself, I'd take the first one over this one, but it's still OFDP at the end of the day and there are few substitutes for it.