Not bad
This really reminded me of the old SEGA Mega-Drive (SEGA Genisis for USA people) Game "Another World!.." basically because thats what the game was like with pit-holes and things falling on you/shooting at you.
Oh and that big tentacle thing was from the start of the game....that was funny to mess around with.
Not bad overall, but you could improve the animation lots. try doing something that isn't a stick guy if you can unless you only want to do stick stuff.
Mabey some soft background music.
But I did like how you skipped onto later parts after the guy dies, instead of going through the whole thing every time.
- Jon.