Stiff Arms
Fun, but there's a few problems; I realise how early in developement this is, but for the most part, these have little to do with that.
The angles you can aim the gun are annoyingly limited. I realise the human arm can't bend in a complete 360° motion, but those blindspots to your reticle would be possible if your character would just turn his body or turn completely around, rather than having to double jump just to hit some enemies directly behind you.
It reminds me of Castlevania, but in the sense of the over-emphasis on bats. It's kind of annoying how something that's (in reality) so fragile and weak is the "main" enemy of the game.
However, I'm looking forward to the complete release. I have the feeling it will be one of the hardest hitters on Newgrounds.