I've seen a lot of "best of" lists, and they almost all come down to a three-way brawl between DDP DOJ, Mushi, and Crimson Clover.
What I'm curious about is the list of games to avoid. I've already run into one or two.
I accidentally bought Red Raptor thinking it was Red Death because I wanted all of the Project Starship games. Red Raptor is... not good. At least not so far in the half hour I put into it. It feels like somebody made a euroshmup by hearing one poorly described and from screenshots, but without playing or watching one in motion. Also, Q-Yo Blaster. I got it after reading AzorMX's "Greatest Switch Shmups" article on it. Sounded like fun, but... I can't recommend it at all. It looks like an old Flash game, in the worst way. Like it's built with old, low-res Clipart taped onto somebody's freshman Computer Science project.
So, having that experience, what other games do you strongly recommend avoiding?