I thought the basic gameplay was decent but it was way more fun for me to try to beat the early simple levels as fast as possible than to get three stars and advance to more complex levels. I think that the standard game would benefit from being faster paced (like the flash portal game) with maybe some unlockable levels/abilities from completing each level with only a few shots and/or being under a certain time (though I understand that this might not be the direction you want to take this in). Otherwise, I thought that this game was pretty cool and with a few tweaks to the controls and graphics it could be a 4.5-5 star game imo.