I finally am going to add a real update to upgradon instead of a small insignificant change

upgrade as much as you can so you can get to the highest wave.   

NEW multiplayer mode is now available for the game                                                                                                                           

⚠️ WARNING ⚠️ it is still in development so I would advise you to not use the multiplayer mode

FIX now saves more things / variables 

please send feedback because it helps way more than you think it does 
ver 2.0.4.1

upgradon (early access)