As a suggestion you may want to have a 'demo disk' version, and use something like ScriptedAmigaEmulator so people can see it in action. So far it seems to run okay with the AROS rom, it just needs a bunch more RAM, which is cheap under emulation anyways ;)
Otherwise, it looks like fun, I'm just absolutely terrible at R-Type style games, so it's on me for not getting far at all, but I'm glad that I could support someone doing new games on the Amiga!