Starts slow and perhaps underexplains things a bit (I'm still not certain what effect skills have in the later portions of the game), but has a novel gameplay loop where you gather resources to send to your previous self, optimizing your growth not through prestiging but through retroactive upgrades (along with the ability to reset and replay your original time loop so that you can interact differently with your purchases as your shenanigans make your past self more efficient).  A few hours long with a concrete story and notable, unusual effects from interacting with the second prestige mechanic.  Well worth a play.