Dang, this was sooooo much fun to play, I super got into this!!!! I am only sort of joking when I say I kind of want a voice over saying "Triple Kill" "Killing Spree!" as you get more combined kills. Super satisfying to play. Only feedback I'd give beyond asking to play more is I think the upgrades were a bit meh, I didn't feel super excited by them or like I was getting interestingly more powerful - I think there is a lot of room for some really interesting experimentation in that area. I could never quite figure out what the blocks/walls did and it was a bit unclear what was happening and the tutorial about the blocks seemed to flash up and be gone faster than I could read it - maybe a continue button their so people can read at their own pace might help? That has probably been my nicest surprise of the jam so far as I didn't have any major expectations but ended up really enjoying it and wanting to continue.
Oh, the music stopped at one point so I think that might be a bug or the music just ran out or something.