A lot of the balance designs were made on a purely intuitive basis. We run out of time for some proper, full fledged testing. The game could definitely use a longer timer, not by much, but enough to make for more interesting choices on which upgrades to buy and when to save your cash for a highscore.
That and tweaking about the portal spawn rates and projectile rates as you said. The curve of how quickly things get overwhelming is nooooot quite there. But there is a way to get into that flow, when everything works out just right, with the right strategy
And thank you very much for all the feedback! Glad you enjoyed it! We might tweak things here and there to make for a more enjoyable experience after the jam. Get that balance juuuuust right, make some improvements.But it likely won't be anything bigger (we already got other bigger fish on our plate oof). At the same time, you never know what the future holds