I appreciate the detailed review! There's a lot to work through in here, but I'll make it through it for sure.
Appreciate the note on entering the wormhole - I'll try to make that a little more obvious when I pick this game back up to work on it again.
The audio on the title screen was supposed to loop, so that's a bug I'll need to fix.
Glad to hear that the game had some degree of replay value and didn't immediately become boring. I was hoping that randomized enemies and the like might help with that - difficulty tends to depend a lot on RNG, though it wasn't tuned to be too difficult. I need to add some enemy types that might ramp that up a little bit.