Interesting and surprisingly addictive game, it was a nice use of theme and it left me wanting to play a more fleshed out version of it.
Few issues like the initial level starting at the top of the screen, typically you start at the bottom and your enemies at the top (chess, space invaders, etc) but it was fine once I realised. The UI and general size of the game displayed very small, however it was still playable.
Would be nice to see hit points on the enemies or have some idea how close I am to killing them too, but in general it was a nice game and it flowed pretty well. Incredibly punishing (especially on your first game or two) but it progressed well with introduction to traps and different arena shapes.
Fun game, good job!
-Greg