Not gonna lie, this game is very addictive. Easy-to-play, hard-to-master kinda game. Next thing I know, I've been at this game for hours, trying to beat the high scores at the leaderboard. Here are my two cents: (1) Allow full-keyboard usage, as in enabling keyboard to select buff, not mouse. (2) Maybe can add in different game modes whereby scoring are counted differently, maybe based on enemies killed, or a mode with auto-picked buffs (3) More fun buffs! (4) More fun enemies! (5) Maybe can add in random-spawn buff like a bomb that clears the map. (6) Co-op mode! Imagine being able to play with 3 or more friends in the same map and see who's the last man standing.
Overall, really enjoyed this game. Keep up the great work!