Thank you so much, and fair play for finishing the whole thing! I'm really glad you enjoyed it.
The rainbow thingy is just the main artifact you have to destroy to finish the game. I was running out of time by then, so that's why it's a little ambiguous! Would definitely have made it more distinct in hindsight. And thanks for letting me know about the R thing, I'll look into that
Thanks again for the rating and the positive vibes here!