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First part, i chose the spider gamemode because of the beat and how smooth the spider gamemode will be because of the teleporting up and down according to the beat. I didn't choose ufo and cube because they feel slow and involves jumping, and with the object usage limitation, i would prefer spider because its really simple to use and the properties of the teleporting.
Second part, i chose the ball gamemode because of the repetitive fast beat of the song and also because the ball gamemode can switch gravity, before the second part, the gravity of my player is reversed, so using ball would switch the gravity back if needed. On the other hand, swing and robot will be upside down and will be worse to be played, i also cannot use the gravity portals because of the limitations leaving me with the ball gamemode.
Third part, i chose the swing gamemode instead of ufo or ship gamemode, solely because i can change the gravity at will again, and the properties of the swing gameplay letting the take a break from the fast paced gameplay. Ufo or ship cant change the gravity at will too.
The last part, i chose robot because the other two gamemodes have been used and that leaves me with the robot, the robot gamemode is also a really good gamemode to end the level with some consistency timed jumps that only the robot can do too, and ending the level after.

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3 more required exercises for Grade 1.5.
This exercise can be repeated for extra points.