Falstad is a unique assassin because of his [Flight]. You want to make sure and save it in the early game for defensive and objective purposes. Do not use it at the beginning of a match to get to a watchtower first of your lane quickly.

You want to be eyeing the closest lane to you waiting for opportunities to fly in and get an easy kill on a low heath assassin. To do this use [Hammerang] to slow and damage your enemy, then follow them with [Lightning Rod] applied. If they are melee keep them away from you.

When fighting in your lane. Stay behind your minions. The [Hammerang] will change its direction when coming back to you so try and make it hit minions on the way back as well in the early game before you get [Secret Weapon].

When in a team fight target assassins with lower health and alway be prepared to [Barrel Roll] out of the fight.

Use [Hinterland Blast] to hit a stunned hero, or force the enemy away from your team. Use [Mighty Gust] by flying behind your enemy and pushing them into your team's range or into a hazard.

Once you reach level 20 you can go anywhere on the map quickly with [Epic Mount]. Use it to help you team, steal objectives, and take merc camps.