Cool graphics and amazing you made this with your own engine. You probably have a lot of new mechanics on your mind but I think dropping baits or bombs would be cool addition. Also maybe some kind of super bonus frenzy mode.
Thanks for uploading.
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Yeah it was pretty easy to hit the ground.
By the way have you considered adding different game modes? I feel a tower defense could be a cool one, something like the vamp vs zombies: You fly and drop turrets, mines, bombs , and you can fly resources from home to build points, goal is to protect a buildings or a love interest...
I just think you have something cool. Keep on going fren.