This was fun! Really nailed the feel of being a puny human beneath a giantess' throne/foot/ass. I like the general concept a lot too, and I didn't encounter any technical issues.
I think my biggest problems with it might be the sprint meter being waaaaay too short, and simply not being sure if there's even a good ending or way to "win". So far, all I've accomplished is being squashed or eaten in various ways, which- is great, from a kinky perspective! But from a "game" perspective, it's a bit frustrating.
If I'm able to win, it'd be cool to have a hint as to how I'd do so in-game. If I can't win, and only hope for the kinkiest ending, it'd also be great to know that! To be clear, it's all technically sound- nothing's broken, and I believe everything works as intended, I think the place I find a flaw in is the inability to actually succeed. A little bit more time and polish, and I think this could really shine, as the giantess bits are great, and I personally love how each size change gives the player more options for movement! Really cool, that.
The ability to fight back, or dodge roll, or prove your worth- all things that would be neat to see in an expanded edition :) Really good first effort though, and it's again a real cool idea.