Thanks for playing, I'm glad you enjoyed it! Did you turn both handles for the right faucet? For each handle, you should only be able to interact with it once. Before you interact, the E will flash to let you know it's interactable. After you interact you'll still see the E until you leave the handle hitbox, but after that you won't see it because the handle isn't interactable anymore. I should probably try to make that clearer, thanks for letting me know! And if you happen to make it to the 3rd stage, I didn't turn on the E for the light switches there, but the light switches are the only thing you can interact with on that level, and they work the same as the handles on stage 2.
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Yes, I did as you said pressed the E then moved away and then the E disappeared and didn't show again. But the portal for the next level didn't show up. I thought maybe it was a bug so I played the game again and for the second time, I press E and pressed it again when it didn't disappear, and still nothing. I'm not sure is it a bug or is there something else I should do.