You know what, the game is not bad. I'm the guy from reddit, I finished it and I gotta say: except for the hilarious bug that makes the right answer NOT spawn, which I ran into a couple times, the gameplay is intuitive and smart. Every kid can sling the slingshot from angry birds and their crazy reflexes will help them not to make maistakes. Also I like the ball growing bigger and the errors saying on board. I'm sure kids will love clearing each level with three stars for the first time. Good job: just fix the bugs, and also I'm not sure the right thing to sell in the shop is ways to make the game easier, maybe consider implementing some whacky skins for the pro players who can just nuke every level with little effort. Just three or four colourful bouncy fellas would help. Good game overall.