Hi guys, my friends and I put together this 1500 points Vanilla Space Marines list and was wondering any modifications could be made. It is meant to be for versatile play purposes... but we are not too sure if it is competitive, so any opinions are welcome. This was made for Brigade Detachment. We are also wondering what can counter this list within 1500 points limit. Please advice on tactics if you think this list is ok or if reasonable changes could be made.

The 1 Devastator Sergeant is using the rule for Understrength Units on Page 242 of core rulebook. It is ok with me and my friends.

HQ:
1 Librarian in Terminator Armour - Storm Shield, Force Stave

Techmarine

1 Primaris Lieutenant

Sub Total HQ: 323 pts

Troops:

5 Scouts - 1 Sergeant Combi-Melta

5 Scouts - 1 Sergeant Combi-Melta

5 Scouts - 1 Sergeant Combi-Melta

5 Scouts

5 Scouts

5 Scout

Sub Total Troops: 387 pts

Elites:

5 Company Veterans on Bike - 5 Storm Shields, 1 Sergeant Combi-Melta

1 Apothecary on Bike

2 Company Veterans

Sub Total Elites: 338 pts

Fast Attack:

5 Assault Space Marines with Jump Pack - 1 Sergeant Melta bomb

5 Assault Space Marines with Jump Pack - 1 Sergeant Melta bomb

1 Attack Bike - Twin Boltgun, Heavy Bolter

Sub Total Fast Attack: 227 pts

Heavy Support:

Devastator - 13 pts

5 Devastators - 1 Lascannon, 1 Armorium Cherub

5 Devastators - 1 Lascannon, 1 Armorium Cherub

1 Devastators Sergeant - 1 Combi-Bolter

Sub Total Heavy Support: 225 pts