Main idea
A modern to tech long/XL level with multiple easy to learn gimmicks, and challenging easy demon gameplay. A variety in gameplay and game modes.
Secondary Ideas
What I must have? Moving objects. Subtle or strong, moving objects are a must to make a level feel lively. Some duals wouldn't hurt too. Cant forget about lots of meaningful triggers like I always do.
What I don't necessarily need?
A memory part. Yeah no I don't need that. But I could have it. Not need but might have. I mean they add to the gameplay a lot
Tradeoff
Quality and Optimization.
Quality because you want a good fun level that feels fair and not like an unbalanced mess.
Optimization because it's always best to not explode mobile devices in your levels. Gives the level a bigger group that can actually play it as well. Because if a mobile player plays a not optimized massive level, yeah no. Boom.