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Thanks for the reply.
True no reason other maps without the theme could work. I'll try out Vrack sometime, thanks for the suggestion.
I really should dig up more or learn to make some already.
I'd suggest http://www.project2612.org/ as a great Genesis music resource (web player too) if you don't already know of it. Dragon Slayer, Dragon's Fury, Devilish, maybe Monster World 4, some of Cosmic Carnage, maybe a bit of Contra Hard Corps, might fit well. Most games have a Sci-Fi style though. I'm sure you have your picks just thought I could mention a few. Dark Sci-Fi stuff works great for dark demon battles though. Oh there's also Golden Axe 1/2/3 but that's obvious. Burning force might fit in a way, good soundtrack there too.
Kobold sounds great atctually, didn't know you were still actively adding to it so best of luck with that.
Tempted to get into map making and try an arcade like (maybe multiplayer co-op balanced) scripted map set for the mod but I have a lot to learn modern GZDOOM mapping wise.
Thanks again for the mod, it's been some much needed stress relief on the go on an android port of Zdoom this year. (works well btw but needs a gamepad/mouse keyboard of course)