You can easily add a non-Steam game to the Steam launcher and then assign the artworks to the empty placeholders.
It will look like this then:
https://imgur.com/a/fINFyOj
(unfortunately, Steam doesn't record the playtime of non-Steam games)
I think your game would be a great addition to the Steam Shmup library.
Hope to see more from you in the future!
I also really liked Satryn, but to be honest I'm not that satisfied with this game. It's not a bad game, the gameplay is still great, although I think the short levels of Satryn had a much better pace. I also miss a side objective, like rescuing your little friends in Satryn. What disappoints me the most, though, is the bland enemy design. There are a few great ones, but the rest are various "symbols" with eyes that could be straight out of the emoji catalog. And all the enemies are barely animated, just floating around.
I usually suck at Bullet Hells and this game is no exception, but I'm loving it. And it is without a doubt one of the best Pico-8 games out there. Since Steam is my main launcher, I created some artwork for it that I'd like to share:
By the way, are you planning to add the 3rd currently unavailable plane?
