I think there's hardly anything to complain; graphics, sound, game-play; all perfect. Kudos!
Probably only the issue with having to choose between two kinds of fixed game controls.
Although some parts were extremely difficult; e.g. the one were the coldness showed the way was really frustrating.
I found a few [non serious] glitches (I think): Once I burned a soldier and suddenly a nearby larvae started to behave like a burning enemy (jumping around from left to right). In a lot of rooms I was able to walk on the ceiling. Then there was this strange bird boss bug, where the bird attacked me first, I left the room and when I returned the boss was stuck (and I was unable to proceed as I could neither kill him). Then there was this bad-ass room (the one which required about 13000 points and you had to jump over the birds: when you leave on the top exit it took me back to the start screen. A few times I was able to do slight wall-jumping (but it took a lot of time).
Parts of the game reminded me of QuackShot (especially "abusing" the birds with the new weapon).
Just two questions:
1) Is there any real secret to find where "the wall on the right seems hollow"? I tried to stack two barrels on each other as I thought there could be possibly a second wall to break (one tile above the ground) but never succeeded.
2) Do you happen to have a Flattr or Paypal account? I consider myself a pirate, but always would like to honor creators of art that I appreciate so much :-)