Very cute! Adorable interaction with the sister, I fell in love when I bounced off of her and she said "oh you're so bouncy!".
Although there are a lot of bugs that I could report, for example when you enter the elevator using the up direction the cursor gets stuck outside the panel, and when you use the upgrade the charcter disappears, forcing a reset, but why stay on those? The aesthetic is cute, the bouncing is very fun, and the controls feel natural.
Personally, I felt the learning curve was a bit steep with all of the things to do before any action happens. There is this big room of exciting gadgets, and a sister that explains all of the details, and before you know it you've spent ten minutes and haven't done a bit of the core game loop. Perhaps that would be an area of improvement?
It looks great! I wish you luck on your kickstarter this month (May)!