Really good game. I can't stop :P I started 2 days ago and now i am on tier 1. In future, i would like to see a new upgrade ( for purple cubes or for new ones). What do you think about skipping some stages? Here are players able to go up to 20k - 30k waves. my suggestion is making a new upgrade for purple cubes. Every level will let us to start 10 or 15 waves later.
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 "Trimps"){kind=icon}