Hard, but I beat it.
Took me a while. Sometimes the answers were buggy. I had to try the snake twice to get it to work. I had to try the math 3 times to get it to work. When typing the letters, if I click the box, the green letters turn white, and thus are invisible til I go back and remove them. A different color might help that. Sometimes multiple tries were necessary, so you were never sure if it was correct.
Anyway, having no walkthru caused me to have to think for myself. Now that I beat it, I'm ok with that. ;) Don't answer anyone who says 'I can't do anything' or I'm stuck in the first room' or whatever. A hint might be ok, but it's nice to have to think for yourself every once in a while. With that said...
Hints: (But you still have to think for yourself)
Room 1: Look at the Periodic Table. The circle colors are there. At the panel, you only need to mess with the top 2.
Room 2: i see you. That's your answer. The pictures are letters.
Room 3: Make a snake. Not too difficult. If it doesn't take the first time, do a square again.
Room 4: Down is clickable, but only in one direction. The sizes and colors are your door code.
Room 5: Turn off the TV and do some math. Click the circles, then you can proceed. Once you have the number, do the math. In Algebra, dots are multiply and slash is divide. I may have made that one too easy. :/
Room 6: Letters relate to each room. I was unfamiliar with Zodiac images. Spell correctly. I used lower case.
If you're stumped, keep trying. It forces your brain to think in new ways, which isn't always easy or fun, but it's better than having someone tell you everything and never thinking for yourself.
Nice game. :)