Wow ! 80 minutes was a long time . Glad that you enjoyed it .
I set a max amount for every type of enemy to avoid enemy amounts getting out of control. The number of enemies each wave stops increasing at about 30 minutes. And because the time is short , the enemies used the same model but with different color textures(I'm not experienced with modeling). Probably different appearance for each type of enemy will make them easier to read. Besides focusing on the ships nearby , I usually hit the purple ones first expecting to get good drops , so I looked at the text pretty often. But it can be showed in another way.
And I'm thinking of changing the Q and W skills into randomly drop when an enemy dies instead of unlimited use by spending coins. The game is a bit easy when enemy numbers grow and your coins overflow.
There's a lot to improve . Thanks for playing and all the feedback!