Mechanically, Cell to Singularity is solid, but it really shines in its theme. The variety of stages and upgrades keeps things interesting. The progression is pretty balanced: the early game is decent, the mid-game is great, and while the late game is a bit lackluster, it doesn't drag on.

The dev team seems dedicated, with regular events that add some nice variety if you're into that. However, the experience is seriously marred by mobile-game style microtransactions. If you decide to play, just ignore those. If you enjoy the game, consider making a single payment for what you think it's worth instead of falling into the microtransaction trap I guess.