If you're on windows/linux/mac you can just scroll to go back! you can definitely " cheat " this way. This is how most Renpy games work! ( I do disable it in a section in chapter 2 when it matters. ) on android there is a back button tho since u can't scroll. Mby i should add a back button to make it more obvious!
Yea there will def be ppl who will just skip through but I dont think penalizing that behavior will actually make them read. I know i've played VNs where theres like 10 hours of text and 2 sex scenes and I just skip through the text lol.
And yeah 3 bux will get you the latest version. So the " value " of that "deal " increases with each new update haha. ( Full release will likely be priced higher tho when it's done. ) Cheers!