Some rounds have power-ups set as random with lots of brick bashing so if you don't get good power-ups then it could be a bit tough. One round took me three minutes; which is long for my liking. A few rounds are beneficial to watch first. There are lots of bombs so if you don't like getting your ship blasted to bits on hopefully every round; then I advise you not to bother playing. This took me 30 minutes to play on Hard difficulty so Easy and Normal will take a little longer. Have fun! I did.
Level sets are graded in Ricochet Infinity.