I really enjoyed playing this game, congrats!
As feedback: please, add a start button/text on the main screen, I wait for the game autostart for a minute or so until I read the comments haha. There's something weird about the resolution, you should definitely check that out. Finally, a small fixed level as tutorial would be great to understand the basics (for example the blocks as health works great but I didn't know you could attack enemies by pushing them).