Seconding this, at first I thought it was obtuse and overly difficult. But once you get a feel for how the synergies work it’s amazing. Despite the simple structure it’s a much deeper and more mechanically complex game than Vampire Survivors, and you have a lot more control over your builds.

On the other hand it’s a positively insidious timewaster. (But isn’t that the point?) I certainly never expected to get 100 hours of fun out of it, but that’s what happened.

As for FPS, visually simpler stuff is perhaps easier to enjoy on the small screen. I highly recommend Amid Evil if you enjoy classic Quake style shooters. I used it to teach myself how to effectively play shooters with the touchpads, which can be a tough hill to climb but definitely pays off. Don’t be afraid to play with the control settings through Steam; personally I run 175% sensitivity, no accel or haptics, with high friction trackball to help quickly change directions. It took a few hours to figure out what worked but once you get a feel for what’s comfortable for you personally it only takes a couple minutes per game to dial in the control settings.