Three shape games that I recommend:
Just Shapes & Beats - Dodge pink stuff, listen to funky tunes, has at least one crossover with another indie game franchise, and has a Story Mode! It's pretty much the base of my JSAB fanstory trilogy, the S3RL Trilogy.
Geometry Dash - If you're a casual then there are some actually less difficult levels to play, also it has a big level editor, which will get even more stuff in the upcoming update. Geometry Dash, although known for its difficulty, may still have some fun stuff to do like icon customization and collecting stuff. You'll eventually get better at this game!
Shapez.io - Factory-building game that's simple and has shapes! It's available on Steam as a full version, but there's a demo online version that's free but only goes up to Upgrade Level 12. You can mix, stack, split, and color shapes to be suitable to the game's current criteria, and there's a Puzzle Mode DLC.
However if you're going for something a little more simple, here's some games I'd like to show ya:
Pikuniku - It's a simple, but short-and-sweet adventure with free money, stolen corn, giant robots, and music that sounds like it came out of Super Mario World, Kirby Super Star, and other places. And you have two legs and can kick stuff.
Super Cat Tales (1 and 2) - Simple mobile game platformer that lets you run around and jump around and climb walls as a cat. You can get other cats to get special abilities and fight bosses. Note that SCT2 is quite grindy near endgame, as certain expensive shop items may be needed to proceed further with the game itself. (You can buy them with coins, there's a level that lets you grind for them)
Bad Piggies - It's a contraption/vehicle-building game that's a classic in its own right. Although it's a spinoff of Angry Birds, this game has a unique identity, and you can unleash your creativity by collecting alts of existing parts and thinking up solutions to getting the Star Boxes and fastest time. Also it has those generic, cheesy crashing, bouncing, and slide whistle sounds from the Hanna-Barbera sound library, which I probably hope it doesn't bother you lol.
Super Fowlst 2 - While retaining the same artstyle that SCT has (Disclaimer: the game is not made by Neutronized, but by Thomas K Young, who used a variation of the SCT artstyle in his newer games), it adds lots of cool stuff like rideable robots, new enemies, a body slam attack, and new gimmicks like bee boxes to the usual Fowlst gameplay formula, which is a mix of Flappy Bird and roguelike dungeon-crawling. It has also randomly-generated levels. My only complaint about the game though is that the SCT-esque artstyle and the new music made Super Fowlst 2 lose a bit of the first game's charm, but overall the gameplay is chaotic and fun.