Thanks for the detailed feedback! I will try to address these things in a post jam version of the game.
Visuals when upgrading - Yeah, good point, I’m thinking of maybe adding some effect on the player or marker flashing marker in the base.
Health on units - I think I will add a short healthbar on the just below units.
Health on castle - It’s a little crowded in the base, but maybe if I replace the middle castle part with a number and health meter that shows it’s current health.
Audio cues - I planned to add this, but couldn’t decide which sounds to play, If all sounds player it would be too much, so maybe just the things the player interact with. I’m going to give it a try
League of legend & RTS - Yeah, I didn’t plan the game to play like league of legend, but I guess both games take inspiration from RTS games and try to streamline the gameplay. I originally planned to have controls to decide with base enemies would go to, and which unit you would send, but I went for a more streamlined approach to reduce the number of buttons, so it could work with four players on one keyboard.
No idea why won or lost - I how this might be improved when base health is more visible. I will also try to add more effects when a base is destroyed and has low health.