If you've got the time machine, you should already have the Orange Key and have access to the room with the frog (Green ö). This is the room below the starting room, where you got the Time Mushyn.

The main goal to beat the game is to figure out the frog's language (the symbols you've been collecting) and to communicate with the frog enough to get the ≈ symbol in the middle of the pond.

I've got a semi-interactive map here https://drive.google.com/file/d/1x44DRD9SrgASo47NcAhcmH1SiymhwQc-/view, open it in a vector art program (I recommend Inkscape, which is free) and you can hide/show layers on it to see where various collectibles, minigames, or other points of interest are.

A breakdown of all the symbols and items is here https://docs.google.com/document/d/1rZXYr4aQcFszHBYuSvSdXV_B8406OZ1oC9SCQgbLRLI/edit#heading=h.upn9mw2vakjo, and I've got a speedrun guide here https://docs.google.com/document/d/1IMSq4s900H7OaYXXG4te-SHF-Z-rhMZ-S2TbSSB5H_c/edit#heading=h.77dasycfqssy but those are both tailored more towards speedrunning rather than a standard playthrough.

I think the exploration, confusion, and figuring out the frog symbols on your own are a big part of this game's appeal, so I'd recommend newcomers use these guides sparingly and try to figure stuff out on their own, but ultimately it's a single-player experience and folks can do what they want.

Thanks! I was on the right track, just needed a few more symbols.