Sorry for butting in but If you go to the creator's Tumblr, you can see that they've actually spoken a lot about topping/bottoming with ren in the game! (it's a bit of a scroll though so you might need to search for it through the 18+ tag)
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So Ren has two sides to him: his "Haruko" side and his "True" side. The creator has said that his "Haruko" side is much more attentive and submissive while his "True" side is much more assured and dominant. So essentially you can get "the best of both worlds" with Ren depending on which side he shows XD The creator has also mentioned that the game will mainly involve Ren being the one to top/dom the MC, but there will eventually be one optional scene (for now) where the MC can be the one to top/dom Ren instead :D
They've also talked about adding the option to choose between being the top/bottom (instead of having the one optional scene mentioned before), but they haven't implemented this idea yet because other game-related things need their attention.
TBH I'm so glad the creator decided to do this (and for free too?!), especially since the 18+ scene is completely optional/skippable. I personally like domming Ren (and whiney men in general) but having the option to switch the roles is very nice to have XD