Putting the weirdness of the character skins to one side, is Muse Dash worth playing? If you can pick it for a couple of quid, sure. The mechanics are intriguing, the music is alright and there's a fair amount or replayability, given the huge collection of songs available too. If you really want to collect all of the skins, there are a fair few to choose from, but too many of them will get you odd looks on your commute to work.
Giga Wrecker Alt. is a physics-based puzzle platformer that falls down in the same places as most games in the genre, but with interesting characters an intriguing story, it's a decent game on the whole. Just be aware that the difficulty is real, so if that's a deterrent, consider yourself warned.
I would be genuinely angry if I had paid money for this RollerCoaster Tycoon game. There is none of the tycoon fun of the original game, the rollercoasters are overshadowed by the shooting and the VR is slapdash at best. The entire experience feels like an alpha build of a rail shooter that someone decided to slap the Tycoon name on to sell more copies. I cannot, in good faith, recommend this game under any circumstances.