Good morning everybody,
I wanted to show off my looping waves as well. In my game the next wave is always chosen at random. I also made some changes, so that enemies in the same wave can be different enemy types, have different paths, different speeds and spawn times.
The used sprites are from the unity assetstore.
Your game looks amazing! Loved all those different weapons. The enemy loops look also great but there’s a small detail you might not be taking into consideration: balance.
If this is just to show off your amazing coding skills then great, but if you are planning to make the game fun, randomness can truly be hard to balance, specially in this type of games which are hard almost by nature.
Hey Yee, thanks for your reply and your feedback. I think you are right that this would be hard to balance. Once enemies are able to destroy my ship I will play around with it a bit and see if I can get some order while still not making it an obvious loop. 
