It's okay, but needs some tweaking to be more fun.
Currently there is a luck factor in the game, because the objects fall so fast. I realise that it would be boring if you just slowed it down like this, but it would help if you made the objects fall at different heights. Maybe even have the objects fall at different speeds.
Because of its speed it looks a bit hard at first, but it's not impossible or anything, I made it in about 5 tries.
There seem to be only 2 levels, that's a bit short.
If you make the character smaller you might be able to make some more interesting level design, like maybe parts above the player that stop the objects from falling on you.
I also found a bug, I can't unpause the game. The browser I'm using is chrome.