Well..
It's a fun little game and overall cute, but one problem I had (that wouldn't let me past the 4th stage, so I had to quit) was that my shooting never worked in the stages. It only worked during the tutorial, so when I got to the "Kill 50 enemies" level, I couldn't advance beyond it, which is why I lowered the score. Also, something that bugs me ever-so-slightly is when I move my mouse too fast and the jellyfish kinda...lags behind, but that's kind of minor to me. Eh.
If I'm not the only one who experienced this problem, when you fix it I'll give the game another go. If I -am- the only one, however...well, it was fun for the first few levels.