This Seeking Tech guide will explain how you can do the seal skip jump in the Let It Slide level of Astro Bot. Use the following video as a reference:
For the first step, jump towards the seal from the edge of the ice.
You then need to press the attack button in the middle of the air and then hover.
When your laser legs hit the seal, its eyes will widen. At this point, you need to let go of X and then press X again immediately.
If you got the timing right, then you will be sent upwards partially off-screen. This should give you enough height to reach the platform with the rotating spikes.