Geometry Dash for mobile. So far the best $2 I've ever spent.
I don't make good levels, but I like making auto levels of good levels.
So that's what I do. So far I've done Infusion (Shadow Gauntlet 5), Magmatic Sanctuary (Fire Gauntlet 5), Unbound, Shrimp (Poison Gauntlet 4), and First Race (Fire Gauntlet 3). I'm working on doing Generation Retro (Poison Gauntlet 5) and Olivia (Daily level that I really liked). The 2 screenshots are from AutOlivia (tentative name), one is the editor, one is gameplay. It takes about 15 seconds to load the level from the editor which is amusing, though it does have almost 80000 objects.
One of the fun parts of auto levels is seeing how creators make their levels, and Olivia seems like black magic. Everything it does is:
A. Super technical and cool, I mostly understand how it works
B. Black magic that I will never understand
Generation Retro is simpler but annoying, so I'm saving that for later.
I also made Memories, which I'm really proud of. It's another level with parts of every other level, but what sets it apart is its inclusion of Ultiate Destruction.
For those who don't know, the trailer for Geometry Dash showed a level called Ultiate Destruction. For the ending of the level, I used a segment of that level and also set it to TMM43's Ultimate Destruction. I got the song to sync well somehow (I can't decorate for the life of me, nor can I make amazing gameplay, but the gameplay that I do make syncs somehow), though some things I learned:
Deadlocked and Fingerdash are waaaack. They do stuff weirdly and it was quite hard to get them to work via custom object transferring. 73248686, if you're interested.