I'm planning on adding a bit of a homage to the Morning Music on the Bubble System on some obscure place because I find it cute. There's actually a lot of other easter eggs that reference a lot of the game we like on obscure places like some menus. I like Gradius' aesthetics and oldschool Konami in general I find delightfully mystifying  but, alas, I'm terrible at most space shooters. Really like Life Force and Guardian Legend on the NES and I really enjoy most of Compile shooters, though! I think I've played through a lot of Gun-Nac on a Famiclone... Anyway, great to hear it works on Linux! We've done all our in-house test on a very low-end machine so we know it at least runs, but it's always great to hear reports from other people. Hope you enjoyed the game!