Not sure how far you got but you have to first select the “powers” you want with the number keys 1-5 and then press space to execute. This will allow you to jump, dash, etc to reach the top. The last one with the pillar was very tricky for me. I don’t remember what combination was required exactly but once you use it the pillar starts going up and you have to quickly jump on it. The second time I played it though, the pillar didn’t go up at all but I was able to do a really high jump.
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I got the pillar to rise up somehow, and found the teacher on the level above. I guess I answered wrong on the question, because the game ended instantly. (Strange thing is, I have seen that conversation before, but perhaps with the neighbour.) Tried again, and this time I fell off the pillar and couldn't get on top of it again after it had gone skywards. Haven't seen any radio, so I guess you got past the conversation I failed. I realize I got the last two runes, so the final parts may utilize them somehow.
The pillar resets if you jump back down. I don’t remember answering a question at the top but I guess I must have answered correctly. I don’t remember if it was the same one as before, the text goes too quickly but I think it was different because they said you should use what you’ve learned? I don’t know, I could be wrong. After the conversation, I was transported outside/back at home.
The radio was on the third floor of a building but I don’t think it’s important.
After I came out I climbed up the building next door to our home and got an object on the roof. Then I went back to the home building and entered the apartment with all the file cabinets. Then I got a message in the diary that I should go home. Did that. Went to the school the next day. There were all these numbered doors but I couldn’t enter any of them so I gave up.
I think I’ve played it 5-6 times now so I think I’m done. Like you said, the black magic temptation story is definitely interesting and that’s what kept me going but now I’ll wait till the end of the jam to see if some of the issues are fixed in an update.