I've been following this game for a while and playing through its various incarnations, so here's some things I've noticed so far with the current one, as well as some general feedback.
- You can earn tokens past the limit, so the limit upgrade does nothing.
- "Keep Money on Prestige" upgrades are too expensive at their rate of 5 * level. It would take several 30+ token prestiges to max them out, but they stop being useful long before that due to limited uses for money (see feedback below).
- There's an "add time when pegs are destroyed" upgrade in the prestige tree for some reason that appears to just be the upgrade for regular money that's already bought. Previous versions had an equivalent of this as well and I'm not sure how it happens.
- If you invest tokens on the prestige screen and click cancel, it resets the skill investments but doesn't refund your tokens.
- The music volume slider doesn't work (I don't think it has worked in any version so far).
All in all it's a fun game in this iteration. Its biggest problem is probably late game progression once you can easily hit all the target scores/run out of regular upgrades to buy, which doesn't take all that long. You'd want to get tokens faster at that point, but nothing really helps with that; even prestige upgrades only help with money/beating stages, so once that's not a issue anymore, there's no incentive to aim for the rest of those.
That said, the token rate does seem to increase for unclear reasons over time, so maybe tying that to an upgrade could be a good step towards more meaningful progression in the endgame? The earlier game is a lot of fun when you're still in that gameplay loop of hitting and overcoming roadblocks, it just runs out of steam later.