Hmm, I think as long as you keep it private between you and your friend, you should be fine. However, if you ever want to make something for the public, I would suggest not using any of these assets (not even the time-stopping mechanic) even in a free product because, again, you don't have permission to do that.
Viewing post in [NSFW] [Free] Time freeze?!! Stop-and-tease adventure comments
The mechanics of stopping time itself are not new. It is probably best not to use this particular implementation of stopping time without permission.
And it's not worth "keeping it a secret" either. Well, I won't spread it, but there shouldn't be any problems with me telling about it... At least I hope that "telling" and "spreading" are different!
Um, no I'm not? You can clearly see that the author is Garage_Dungeon, not me. (it says so in the URL and on the top-right of the web page next to "View all by" and "Follow").
And even if I was, I certainly wouldn't hand over development to someone that hasn't even played it, let alone someone who hasn't published any games of their own. How do I know you can make a good game if you haven't made any games? How do I know you'd stay true to my vision if I don't even know whether or not you even like what's already here? Why didn't YOU play the game first to see if it's something you'd even WANT to develop further?? Why didn't you play the game first before asking for the source files?? Heck, you didn't even ask for permission to take over development; you just commanded "give it to me," as if you felt entitled to it. And besides, did you honestly think I somehow missed all the other comments even though I read and replied to yours? Yeesh, no wonder you got downvoted; you could have easily figured this stuff out by thinking about them for a few seconds.
Maybe the translation is inappropriate. But I meant for someone (besides me), preferably the author, to continue the game.
I'm using a translator, so you probably didn't understand anything. I meant that in the comments, many people are asking for continued development.
And I, even though I haven't played it yet (due to my weak hardware), support people's requests for a sequel. I won't do it myself, as I'm interested in other aspects of all games...
I haven't asked and won't ask to take any game under my wing... Except for Tetris, but it seems like no one asks them (the Tetris developers) for permission. I would ask, but I don't know them and I'm lazy.
I repeat, I am not interested in developing this game on my own, because I have my own projects and the PC won't handle such a game right now.
And also, am I afraid to publish games in itch.io in the first place? [is obliged]
I repeat, I am using a translator! There may be, and apparently there are, many mistakes!