Hello, thank you for the question, the quick answer will be "yes". However, I'd also like to touch on a few points:
If I download these resources, can I use them in commercial games: Yes. This is valid regardless of whether it's free or donation-based. There's no issue in using them. The only difference is that we didn't ask for a definite fee.
Do I have to donate money: Donating is not mandatory for this song, we left it as an option. Getting it without paying a fee or making a donation does not affect the license.
I don't understand the license: The confusing part I think is the section about avoiding selling the songs as .wav files to other individuals. Using music for commercial purposes (for example, in a game project you made and plan to earn money from) is related to usage rights. However, selling the music as a .wav file (like a trade, like Intersonic Sound) to other parties is different, which we indicated we do not want. It's about not granting the right to sell the music file itself. Legally, music embedded in a project, i.e., a game, differs from the music product itself. In short, if you have no intention of selling our music as a music product to someone else, there is nothing in the license that restricts you.
If you are making and selling a game for commercial purposes, there is no obstacle to including this product in it. Since what you want to sell is the game, and all the music will be embedded in the game, the main material you are selling is the game.
It got a bit lengthy because I explained it in detail, but you can be at ease.