Game is awesome and we had just the same idea (physics based inventory), but decided to go other way around.
I like your implementation of the idea, but I really need more items to place in the inventory and at least some level of harder progression - speed up / new items / new challenges. Overall, really nice idea and implementation!
Very promising game, looking forward to see what this game will become. I like the artstyle and overall juiciness of the game, but players might be confused with the SNKRX game, which does looks the same.
From the gameplay perspective I do like building and vary upgrading ways, but don't like J/S system. I can see that each tower spend some energy each second, but seems like overall J spent depends on enemies killed too? I can pass a few days without upgrading any towers, but each day my total taxes would be different. On later days I completely ignore my taxes, because I can't influence on that (disabling towers is not fun, especially if I've upgraded them).
I think energy system might be interesting, like building more flowers to generate energy (and connect them with the power lines, like in Mindustry), maybe some towers would drain energy from nearby towers or anything.
Also, please, do not stop the game when the window is not focused. Since I do nothing when fighting goes, it would be great if I can switch windows and do some other stuff on my PC.
I do enjoy this game and want to play it more in the future. Keep on keeping on!
Fun and challenging game! I like sound effects and overall simplicity - but it would helped a lot if you project dice sides on ground, since from the camera perspective I can't see sometimes on what side I will land my next move
