This game is charming despite it's freakishly easy difficulty. You can amass hundreds of apples very quickly and line the entire track with the green turret and the game kind of plays itself. Adding some variations to the towers available and a noticeable increase in strength of the units would make this game better! Also, the current map allows for a lot of unused space where really only the apple trees can go. I second the recommendation below that tower upgrades would be super cool like Bloons TD6 does.