Yeah gotta be real, I ran out of time and didn't get to balance the last purchase. Thank you for noting that, I updated the description to help others. Glad you enjoyed the rest though! Thanks for playing.
Feels like dropping the red shape a tier on the final unlock would fit. As it stands you need 18 of the 7th tier shape, but the most you can get per cycle farming is about 1.5 of the sixth shape. So that's over 90 charges of the maxed red collector. :O Going to try to muscle through it though.