For the positives, the visuals are actually quite nice for what this game is, though the screen can get a bit too cluttered very quickly. The hearts can also afford to be a little more different from the enemies.
With that said, there are a few issues to report. It's unclear how much health the player has with no visible health counter, and it's unclear when a player is picking up additional health or crashing into other ships. There just aren't any visual indicators that gives the player any information about how they're doing during the game.
The building blocks for this game are definitely there, I can tell. It just needs some polish and testing!