The best is to start with the game on hard mode, till you get later some problems, then you should change it to easy/normal.

The first levels are no problem not even the challenges, later the challenges get to 2-3 challenges each map and i would do it on easy difficulty but you should know the map well enough on the later levels and you need to handle the maps on hard difficulty first, so best is learn the level 1 by 1 and best way is to try many ways on easy, then make the hard mode and then the challenges on easy mode again, if you like a challenge try them on normal or hard, to test your skill.

i make 40 of 41 challenges only nr. 17 speed run i missed. There are a total of 45 so you can miss till 5 challenges of the later maps (15-20). Rest is doing it again and again till you know the way full concentraded at sleep. Dont do to much plantations each one cost you 5 seconds, for a speed run challenge you should do it so less you can, or only if you really get more then 6-7 or more seconds out of it as a shortcut, some times its better to run the long way (like the wall).

To get 120.000 points you need 20 maps 6.000 but its if you make on the most 1-10 on hard mode 6500-7000 or even more then you can maybe hand handle the other ten with 5000-5900. No big deal.

To get one other achievement you need to wait on a level, i take level 1 and stay 1 step from the tree (maybe it was 2-3 steps) but so that all parts after you fall down and no more can fall and then after all parts are down for 100 % sure, touch the tree and you get the achievement. Very easy.

For offline mode just play the rounds, the set up controls change a bit but nothing special, the half screen make a bit more trouble so its better you play it after you beat all 20 maps on high difficulty first to know them and then if you want it easier if its a map you dont like maybe 15-20 and want some other just fall down at the start and hope you have more luck with the next maps.

Multiplayer play with a friends and share wins, here is it too on hard difficulty speed but no trouble if you have done it before and like offline mode you can die at start and wait for easier maps.

So its easy-normal to finish the game, only speak with a friend and then both master single player first and then do online player together. Maybe you have even fun at it and make 1 real round who is better (faster in reaction or smarter with the way).

Any problems? Ask me or the developer for help. Thx for reading.