Thank you so much for playing!
Regarding continuing - original plan was to have no continues at all, but it felt like it'd be way too punishing and frustrating, so 1 continue was added last-minute. Sadly the SHMUP Creator engine is a bit limited and there isn't an easy way to reset the walls on using a continue, so if the player gets squished there's a very weird behavior of instantly dying when they respawn. Not sure how I'll fix it yet, but point taken ^^
The 2 endings aren't tied to your score or continues used - but you also don't get the option to not defeat the boss after bringing their shield down. The walls are merciless, and will only recede when you show your worth... However, you *will* get to choose between ambitious and empathetic options at some point. I won't spoil the rest ^^ (by the way, there might just be a tiny easter egg related to hugging someone after you beat the game, but you didn't hear it from me :P maybe I'll do something more with it in the future)
And yeah, sorry about the key binds thing - the engine doesn't allow you to rename them yet, and it can be really confusing, especially considering that one of those "Shot X" is not used in Perdition Sphere at all. Hopefully will amend it in the future. Again, thank you for playing - some waves and bosses may require a little strategy, so don't hesitate to ask me for tips and the like if you decide to revisit the game again! ^^