A lot of well thought design in this game, though not too well communicated to the player it is there. In the health bar etc. which was nice to see. It's an interesting concept though there wasn't too much to mix up the gameplay throughout since it was just endlessly spawning enemies. Some sort of power up could help. The ability to get ships back as well. Along with maybe tweaking the difficulty to allow for some tweaking on the abilities and such.
Cause currently the abilities cooldown feels extremely long. Which lead to me generally only be able to use them once per run, which essentially removed them from the game for a mass amount of the loop. So tweaking difficulty to be easier/harder or maybe making the abilities cooldown shorter or make them stronger etc. could balance it out.