Awful game
Am I seriously supposed to like this? Well, there seems to be so little effort in the piece, that I'm not sure, in all honesty.
Single button control really grates on the effect of the "game" and I'd certainly suggest that more time in the programming forum would help you out here. learn how to create more options, such as jumping over low tentacles, which extend out to try and grab you, while ducking under high ones. This would increase the gameplay experience so much and it's really not all that much effort. Powerups might be a better option if they occur and you have to jump or duck into them, just the same, as this requires more skill, particularly if you're trying to dodge tentacles as well. A little animation when you collect a powerup would help - I wasn't sure at the start about collecting the
Why not have a health level, where you can get struck a few times, but still let you get away? Little things make all the difference.
Work on the art - the shitty pink background needs a lot of work, but then again, so does the foreground. Work on the detail, by zooming in and looking at what you can change there - when you zoom back out, it will make such a difference to the pieces.