i could definitely do the screenshots and icon part (i have a bit of experience on UNITY 2022 but not code sorry) and (if you accept this) just 30% is fine, also i recommend adding sound effects (such as rolling over wood, knocking into walls, different balls aand maybe tutorial maps and progressivly harder and harder maps. a gamepass idea (for xtra profit) could be; Custom Maps, All Maps Unlocked, all balls unlocked or FULL GAME (all packs above) i also recommend an ad system, ad for a reward (optional) more (insert currency here) at end of round and respawn for 1 ad (2x max). also a daily reward system, showing first week (with a rare ball at the end on day 7 and next week you get a crate? etc… after a month (in a row but end of week rewards can only be collected once) maybe something like: 1 crate and a rare ball and VIP for FREE 3 days (no ads, 2x daily reward and all VIP maps and balls.
this is just option tho ofc! have fun coding!