Hey man, good first try! The hardest part about making games is just publishing it and getting it out there!
After you export, open the HTML file in notepad, add the following script:
<script>
window.addEventListener("keydown", function(e) {
// space and arrow keys
if([32, 37, 38, 39, 40].indexOf(e.keyCode) > -1) {
e.preventDefault();
}
}, false);
</script>
This will prevent the page from scrolling with the arrow keys.