Recent reviews by Mart :D

Got stuck a few times and looked for a walkthrough on Youtube.
Stayed stuck, because my balls and block just wouldn't get the same momentum and inertia as in the walkthroughs.
Some levels are semi-unbeatable, because they require godlike luck to get the right RNG on multiple actions.
Get Zup!, because it has reliable mechanics.

Thousands of free achievements are nice, though. I'll personally stick with more valuable achievements from different games, but I like seeing how creative some achievement showcases get with games like these.

Edit:
Changed to a positive review, because the game does a full achievement check upon beating the final level.

I have 118.000 points in multiplayer and I still play!

It says partial controller support, but they basically mean that if you don't have a controller, you will have to pick a key on your keyboard for every button a controller would have.
There are no preset keyboard options, making the game very hard.