I like the game. The death sound and enemies' different ways of dying is nice. Don't know how low and high stance is different, I just use high stance and crouch shoot at everything :D
I agree with other comments here. instant death from pit and explosion is frustrating. Adding jump buffer will help a lot, because I died many times from jumping too late.
The snakes are hard to spot, if this is intentional, then you did very well.
For the boss, it would be nice if there is an indicator of how big his explosion will be, to reduce frustration from dying even when you think you are safe.
Look forward to see what this game will be like once it's finished !