Version 0.5.5 is almost here.
In this version I put the focus on optimizations, the enemy bosses and the arcade mode. Performance in single/online games has been checked and improved. The AI movement is smoother now on clients, and the game runs faster than ever with more enemies. Test with 200 enemies:

i5 4210U + Nvidia 840M = 35 fps
i5 3570K + Nvidia 670 GTX = 90fps+

Now the enemy bosses are stronger. They will be harder to kill and once a boss appears (ally or enemy) a permanent health bar will be displayed on the right (until it dies).

All sounds have been changed to 8-bit era for the Arcade mode. Wait for the incoming gameplay video!

There are other improvements that will be revealed along with the version, probably this weekend.

Stay tuned!