Thank you for your kind reply!
Yes I understand. Honestly, I was a bit hesitant to make an account here as of now because I know my current goal is just "covering" instead of actual remixing until I get some practice. Then again I could get useful advice, so I ended up trying! Right, I found Gargoyle's Quest a suitable game to begin with because of its short but very characteristic soundtrack, kind of a first step to introduce own ideas to already existing songs. I tell to myself 'If I was asked to update this soundtrack for a remake, what can I do with the source?'. So that's why I'm not fully going into remix territory yet. But sure thing! I will apply your tips in the future.
Ohh really? Reaper's master peaked around -0.5 and with all my volume output turned to the max it sounded loud enough through the entire song to me, hmm...
All in all, I'm glad I'm going the right way. Hopefully someday I try actually submitting something! Thanks again, and have a nice day you too!