Thanks so much for such thoughtful feedback! Regarding the plus and minus buttons, we simply forgot to translate them into English 😂 (we're Brazilian). As for the UI issues, we plan to address them after the jam ends (time was really tight).
By the way, I saw in your stream that you ended up losing on Level 2. We realized (too late) that the game got too difficult—there are actually 10 levels in total, plus 4 or 5 other enemy types. We'll improve the balancing in future updates, too!
Thanks again for the feedback!