I love the new update Alpha 5 and contributed to the cause -- I don't see the issues that others have been mentioning, like I don't see that the new cel-shading outline being too strong (maybe I play at high enough of a resolution that it isn't a factor), or camera being too sensitive. All have been great.
Some things I think would be great for the next/future updates:
1. Crouching Mechanic: Would be great to crouch to stay a bit more hidden in places, and even crawl. Seems like a thing that would be very typical of the scenario (don't ask me how I know...). Would make a great visual, seeing Rika bent over so you can more clearly see her pussy and asshole. Also --
2. Masturbation in different poses: When crouched, masturbation would be more of an 'M-pose' shot of Rika playing with herself. When crawling, would be more of a bent over masturbation pose. All would be great visuals.
2b. Masturbation with more than rubbing: Maybe more fingering inside (I know you've said no penetration...)
3. Squirt/Pee: Through another bar that fills up over time, how about some squirting during orgasm and also the mechanic to pee when she wants to (also leaving her vulnerable while peeing which could raise the excitement meter). Same mechanics as before, peeing standing up, crouching in M pose, or bent over.