That sucks that you bought it too.... It just feels very underbaked, and I'm not sure I read anything about the impressions of its weird menu design or lack of leaderboards. A few sites were giving it solid 7's on Xbox, so at this price I assumed there was some meat here to be found, but the ideas on board, seem very minimal, and like you stated, I just don't feel an urgency to explore further..... There seem to be very few mechanics introduced either.
In comparison, the Art of Balance is a solid pickup, and having bought it once or maybe even twice prior on Nintendo systems, I feel much happier with that $9 purchase!
Oh, and I checked on Steredenn, and I played it 8 times prior to last might, as I played twice and unlocked the Daily Runs. I think my gripes still hold, sadly, as I feel there's no inertia, or rumble to the ships and opposing ships. I don't really feel like there's a space battle going in, and the backdrops could be replaced with ajything else, and it would feel just the same. The enemy wave design feels so minimal and doesn't harken back to classic enemy wave patterns, so everything just feels grating to me in this game. I can definitely see it's combo strength, at hand, like you mentioned though! I'll keep at it! And oh, I definitely like solid rogue likes/lites. Even though it's not a hardcore one, I loved Gungeon, and put over 100 hours into it.