Good fun game.
Satisfying to get the marble rolling fast through the levels! However, a lot of the levels do have timed moving platforms, or several tight corners requiring slow speed throughout, which can be a bit frustrating in a speedrunning game.
It is pretty easy to get the silver time (just get to the goal without dying, and you probably have it), but some of the gold times can be pretty tight (although still have plenty of wiggle room - normally you can get gold with a clean run with no shortcuts, or a slightly bumpy run with some of the shortcuts). There is the elusive Platinum medal, which I only have a few of - they generally require use of shortcuts, as well as precise movements. It would be nice to see the plat requirements after getting the gold, though.
There is a multiplayer mode, which no-one plays, so unless you want a local game, don't get it for the multiplayer.
Menus are fine, and graphics are fine. A bit janky, could have had a bit more polish, but the gameplay is good enough to forgive that.
Importantly, there is a quick reset level button (d-pad up) - it was a lifesaver!
This game would probably suck on a keyboard, as precise analog movements are required. (Some platinums may well be impossible on keyboard, I'm not sure though)
Price-wise, it is very expensive for what it is (I think 40aud), so probably wait for a sale.
7/10 Good core concept, but with a general lack of polish. A decent bit of fun - but don't pay full price, wait for a sale.